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利用青岛市大沽河下游海水入侵区的砂样、海水、地下水进行土柱试验,模拟海水入侵过程中可能发生的水文地球化学作用。结果表明,海水入侵过程中在混合作用的基础上,阳离子交换吸附作用是主要的,该作用通常发生在地下水与粘粒之间,尽管试验中所取砂样的粘粒含量很少(2.99%),但是现象非常明显,Na+与Ca2+、Mg2+发生逆向交换;Mg2+与Na+交换平衡后,又与Ca2+发生交换吸附;而K+与Ca2+仅发生了少量的交换吸附作用。同时海水占地下水比例40%左右,地下水中开始出现方解石和白云石沉淀;海侵过程中石膏始终是溶解的。以上研究有助于推动海水入侵、海退机理的研究,为海水入侵预测、定量评价与防治提供科学依据。
Sand samples, seawater and groundwater from the seawater intrusion area in the downstream of Dagu River in Qingdao City were used to carry out soil column tests to simulate possible hydrogeochemical interactions during seawater intrusion. The results show that the cation exchange adsorption is the most important factor in the process of seawater intrusion. The effect of cation exchange adsorption is usually between groundwater and clay, although the content of clay is small (2.99% ), But the phenomenon is very obvious. Na + exchanges reversely with Ca2 + and Mg2 +. After exchange equilibrium between Mg2 + and Na +, it exchanges exchange with Ca2 +, while only a small exchange exchange takes place between K + and Ca2 +. At the same time seawater accounted for about 40% of the proportion of groundwater, calcite and dolomite precipitation began to appear in groundwater; gypsum is always dissolved during the transgression. The above studies are helpful to promote the study of seawater invasion and return mechanism and provide a scientific basis for the prediction, quantitative evaluation and prevention of seawater intrusion.